Newbie Question: How To Disable Background Sustain

Hello. This is especially noticeable when using the Concert Harp(sustain, reverb and delay are turned off, I know sustain pedal is inverted for the harp, aside from the la piano preset)
but no matter what, there is always an almost metallic reverb/sustain like effect when I play. I'm using on three different devices.
This doesn't happen on piano. Just the harpsichords(blanchet and grimaldi) and  both harps.

Any advice? Thank you!